JPH075309Y2 - Anti-vibration device for marine equipment - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a vibration isolator for equipment that is a vibration source such as a main engine, a generator, and a boiler mounted on a ship.

[Conventional technology]

FIG. 7 shows an outline of a conventional vibration isolator for a marine main engine. In order to prevent vibration of the main engine 1 mounted on the double bottom 2 of the hull, a connecting member 4 such as a steel round bar for connecting the main engine 1 and the hull structure 3 such as a deck is provided. And
By increasing the rigidity of the connecting member 4, the vibration of the main engine 1 is reduced.

In addition, a spring system may be interposed in the connecting member, or the main engine 1
The one with a dynamic vibration absorber attached to the upper part has been developed.

[Problems to be solved by the device]

In recent marine main engines, there is a problem in that the height of the main engine increases as the stroke increases in order to save energy, and it is easy to vibrate in the horizontal direction. Therefore, vibration isolation is extremely important.

Conventionally, as described above, the connecting member 4 having high rigidity is provided between the main engine 1 and the hull structure 3 for vibration isolation. In some cases, the vibration of No. 1 is transmitted to the hull side, causing a large vibration in a living area such as an upper structure of the hull, which significantly deteriorates the habitability.

As described above, the conventional vibration damping device using only the connecting member 4 results in a conflict between the reduction of the vibration of the main engine 1 and the reduction of the vibration transmission to the hull structure 3. Therefore, it is necessary to set the rigidity of the connecting member in consideration of the effects of both, but the actual design is very difficult, and at present, the rigidity of the connecting member is made as large as possible to avoid the resonance of the hull structure 3. Therefore, the connecting member 4 and its mounting structure have a heavy structure, which requires enormous steel materials and cost.

Further, if a spring system is interposed between the main engine 1 and the hull structure, resonance may occur, and if a dynamic vibration absorber is mounted on the upper portion of the main engine 1, many vibrations will be supported to support the dynamic vibration reducer. There is a problem that a reinforcing structure is required, which causes an increase in weight.

The present invention is intended to solve the above-mentioned problems, and improves the mounting structure of the vibration isolating connecting member from the marine equipment to the hull structure, and by attaching the dynamic vibration absorber, It is an object of the present invention to provide a vibration isolator for marine equipment, which is capable of achieving both vibration isolation and reduction of vibration transmission force from the marine equipment to the hull structure.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the anti-vibration device for marine equipment of the present invention comprises a high-rigidity anti-vibration connecting member attached at one end to the upper part of the equipment that is a vibration source mounted on the marine vessel. An intermediate platform connected to the other end of the connecting member for use, and a spring system interposed between the lower surface of the intermediate platform and the upper surface of the hull structure to support the intermediate platform on the hull structure, A dynamic vibration absorber supported on the intermediate table is provided.

[Action]

In the above-mentioned marine equipment vibration isolator of the present invention, the vibration of the marine equipment such as the main engine is reduced by the action of the dynamic vibration reducer.
Further, if the rigidity of the spring system supporting the intermediate table in the horizontal direction is made small, the transmission force of the vibration from the marine equipment transmitted to the hull structure is also reduced at the same time. Then, the dynamic vibration absorber can be properly supported by the intermediate table provided on the hull structure via the spring system without burdening the marine equipment itself.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.
FIG. 1 is a front view showing a schematic structure of a vibration isolator for marine equipment as a first embodiment of the present invention, FIG. 2 is a graph showing a response of a top portion of a main engine when the device is used, and FIG. It is a graph which shows the vibration transmission force from the top of the main engine to the hull structure when this device is used.

As shown in FIG. 1, one end of a high-rigidity vibration isolating connecting member 4 is attached to the upper portion of a main engine 1 as a device that serves as a vibration source and is mounted on a double bottom 2 of a hull. Then, one end of an intermediate table 5 is connected to the other end of the connecting member 4, and the intermediate table 5 is supported on the hull structure 3 such as a deck through a spring system 8.

Further, the vibrator 6 is supported on the intermediate table 5 via the spring system 7, and thus the dynamic vibration absorber A is constituted by the vibrator 6 and the spring system 7.

With the above-described configuration, in the first embodiment, the upper portion of the main engine 1 is connected to the hull structure 3 via the connecting member 4, the intermediate platform 5 and the spring system 8, so that the rigidity of the spring system 8 in the horizontal direction is increased. If is made small, the transmission force of the vibration transmitted from the main engine 1 to the hull structure 3 is reduced.

On the other hand, the vibration of the main engine 1 is reduced by the action of the dynamic vibration reducer A including the vibrator 6 and the spring system 7.
Further, since the dynamic vibration reducer A is supported on the hull structure 3 by using the intermediate table 5, the dynamic vibration reducer A is supported as compared with the case where the conventional dynamic vibration reducer is supported above the main engine. There is also an advantage that the support structure is simplified.

2 and 3 show a main engine 1 having a resonance point of 500 cpm.
On the other hand, the vibration absorbing effect when the frequencies of the dynamic vibration absorbers A are matched is compared with the case where there is no connecting member and the case where only the connecting member is used.

As shown in FIGS. 2 and 3, when there is no connecting member, there is no transmission force by the connecting member, but the response at the top of the main engine increases at the resonance point. When only the conventional connecting member is attached, the response at the resonance point can be reduced, but the vibration transmission force is extremely large. In the case of the device of the present invention, the response of the top of the main engine can be reduced and the transmission force can be sufficiently reduced within a range centered on the set frequency of the dynamic vibration reducer.

As described above, according to the present device, it is possible to achieve both the vibration isolation of the main engine 1 and the reduction of the vibration transmission force from the main engine 1 to the hull structure 3.

FIG. 4 is a front view showing a vibration isolator for marine equipment as a second embodiment of the present invention. In this second embodiment, the movement on the intermediate table 5 is compared with the first embodiment. The vibration absorber A is configured by supporting the vibrator 6 on the support base 9 provided upright on the intermediate base 5 via the U-shaped leaf spring 10, but the other structures are exactly the same. Also in the case of the second embodiment, it is possible to obtain substantially the same operational effects as in the case of the first embodiment described above.

In the third embodiment of the present invention shown in FIG. 5, a dynamic vibration absorber A that utilizes sloshing of a fluid is shown. That is, the dynamic vibration reducer A on the intermediate table 5 is configured by putting the liquid 13 in the U-shaped tank 11 and providing the air chamber 12 as an air spring on the liquid surface.

Further, in the fourth embodiment of the present invention shown in FIG.
Supply / exhaust pipes 14a and 14b and a pressure adjusting valve 15 that connect the left and right air chambers 12 and 12 in the embodiment are provided. Although not shown in the drawing, the pressure of each air chamber 12 is adjusted by a pressure control mechanism, and the dynamic vibration is adjusted so as to correspond to the vibration frequency of the main engine 1 according to the change in the rotational speed. The instrument A is tuned.

In the case of the above-described third and fourth embodiments, the dynamic vibration absorber A
Except for the above, the structure is similar to that of the above-described first embodiment, and thus, in the case of the third and fourth embodiments as well, it is possible to obtain substantially the same effect as that of the first embodiment as a whole. You can

[Effect of device]

As described in detail above, according to the vibration isolator of the present invention, the following effects and advantages can be obtained.

(1) Since the upper portion of the marine equipment, which is a vibration source of the main engine, etc., is connected to the hull structure via the vibration isolating connecting member, the intermediate stand and the spring system, the transmission of the vibration transmitted from the marine equipment to the hull structure. The power is reduced.

(2) Since the intermediate base is supported on the hull structure via the spring system and the dynamic vibration absorber is provided on the intermediate base, compared with the conventional dynamic vibration absorber being supported by the marine equipment itself, The supporting structure of the dynamic vibration reducer is simplified, and the vibration absorbing effect of the dynamic vibration reducer makes it possible to sufficiently obtain the vibration damping effect of the marine equipment.

(3) According to the above items (1) and (2), the common connecting member is used to achieve both the vibration isolation of the marine equipment as a vibration source and the reduction of the vibration transmission force from the marine equipment to the hull structure. be able to.

[Brief description of drawings]

FIG. 1 is a front view showing an anti-vibration device for marine equipment as a first embodiment of the present invention, and FIGS. 2 and 3 are graphs showing the effects of the device of the present invention in comparison with the conventional case. FIG. 4, FIG. 5, and FIG. 6 are front views showing the vibration isolator for ships as the second, third, and fourth embodiments of the present invention, respectively. FIG. 8 is a front view showing a conventional vibration isolator for marine equipment. 1 ... Main engine as marine equipment, 2 ... Hull double bottom, 3
... Hull structure (deck), 4 ... Vibration isolating connecting member, 5 ...
… Intermediate stand, 6 …… Vibrator, 7,8 …… Spring system, 9 …… Support stand, 10 …… Leaf spring, 11 …… Tank, 12 …… Air chamber, 13…
… Liquid, 14 …… Supply and exhaust pipe, 15 …… Pressure control valve, A …… Dynamic vibration absorber.

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Claims (1)

[Scope of utility model registration request] 1. An intermediate stand having a high-rigidity anti-vibration connecting member, one end of which is attached to an upper portion of a device serving as a vibration source mounted on a ship, and an intermediate base connected to the other end of the anti-vibrating connecting member. , A spring system interposed between the lower surface of the intermediate table and the upper surface of the hull structure to support the intermediate table on the hull structure, and a dynamic vibration absorber supported on the intermediate table. The anti-vibration device for marine equipment, which is characterized in that